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Need help using AVFoundation

Hello, I am writing an app to use for my thesis which involves taking sound files of vowels and consonants and adding them together (so a DIY text-to-speech system). I know how to record the audio, but I don't have a clue how to retrieve the sound files back and string them together to make speech.

If anyone knows how to do this in swift, you would be a lot of help. Thanks!